﴿ وَيَسْـَٔلُونَكَ عَن ذِى ٱلْقَرْنَيْنِ ۖ قُلْ سَأَتْلُوا۟ عَلَيْكُم مِّنْهُ ذِكْرًا ﴾

“AND THEY will ask thee about the Two-Horned One. Say: "I will convey unto you something by which he ought to be remembered."”

Please check ayah 18:84 for complete tafsir.